package org.example.springbootwebexample.interceptor;

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.example.springbootwebexample.pojo.Result;
import org.example.springbootwebexample.utils.JwtUtils;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * 定义拦截器
 */
@Component
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


        //1.获取请求url
        String url = request.getRequestURL().toString();

        //2.判断请求url中是否包含login，如果包含，说明是登陆操作，放行
//        if(url.contains("login")){
//            log.info("登录请求，直接放行");
//            return true;  //放行
//        }

        //3.获取请求头中的令牌(token)
        String jwt = request.getHeader("token");

        //4.判断令牌是否存在，如果不存在，返回错误结果(未登录)
        //if(jwt == null || "".equals(jwt))
        if(!StringUtils.hasLength(jwt)){
            log.info("获取到jwt令牌为空，返回错误结果");
            Result result = Result.error("NOT_LOGIN");

            String notLogin = JSONObject.toJSONString(result);

            response.getWriter().write(notLogin);
            return false;
        }

        //5.解析token，如果解析失败，返回错误结果(未登录)
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            //throw new RuntimeException(e);
            log.info("解析令牌失败，返回错误结果");
            Result result = Result.error("NOT_LOGIN");

            String notLogin = JSONObject.toJSONString(result);

            response.getWriter().write(notLogin);
            return false;

        }

        //6.放行
        log.info("令牌合法，放行");
        return true;

    }

}
